K.C. Leong

Nanyang Technological University

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Jin Yao Ho

University of Illinois Urbana-Champaign

Liwen Jin

Xi'an Jiaotong University

Teck Neng Wong

Nanyang Technological University

Chun Yang

Nanyang Technological University

S. M. Sohel Murshed

University of Lisbon

John C. Chai

United Arab Emirates University

Kin Keong Wong

Agency for Science, Technology and Research

Indro Pranoto

ADA University

Gao Qing Lu

University of Surrey

H.Y. Li

Nanyang Technological University

Cooperative Institutions

Nanyang Technological University

Chinese Academy of Sciences

Massachusetts Institute of Technology

Singapore Institute of Manufacturing Technology

National University of Singapore

University of Illinois Urbana-Champaign

University of Chinese Academy of Sciences

Harbin Institute of Technology

Tianjin University

Illinois Institute of Technology

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Characterization of Electrokinetic Properties of Nanofluids

Journal of Nanoscience and Nanotechnology (2008)

S. M. Sohel Murshed K.C. Leong Chun Yang

The effects of pH value, surfactant, and electrolyte concentration on zeta potential, particle agglomeration, and thermal conductivity of nanofluids are investigated. The zeta potential of TiO 2 (15 nm) nanoparticles in deionized water of different pH values was measured and the iso-electric point was found to be between 4.9 and 5.2. Addition of surfactant in the base fluid increases the zeta potential and thus increases the effective thermal conductivity of nanofluids. The results show that the higher the electrolyte concentration, the smaller the particle zeta potential, which results in increased agglomeration of particles. The enhanced thermal conductivity of TiO 2 /deionized water-based nanofluids was found to decrease with increasing pH value or electrolyte concentration. At 0.2 volume percentage of TiO 2 nanoparticles, the decrease of thermal conductivity of nanofluids was within 2% when the pH value or electrolyte concentration was increased from 3.4 to 9 or 0.01 mM to 10 mM, respectively. The hydrodynamic diameter of agglomerated nanoparticles in base fluid was also measured and found to increase with increasing electrolyte concentration.

Zeta potential

Particle (ecology)

Base (topology)

10.1166/jnn.2008.18369

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Citations (11)

An analysis of natural convection film boiling from spheres using the spherical coordinate system

International Communications in Heat and Mass Transfer (1995)

C.P. Tso K.C. Leong H.S. Tan

10.1016/0735-1933(95)00075-5

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Citations (3)

Fluidized bed coating of copper cylinders

Journal of Materials Processing Technology (1995)

K.C. Leong Gao Qing Lu

10.1016/0924-0136(94)01691-s

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Citations (7)

Experimental Study of Passive Heat Transfer Enhancement in Drag-Reducing Flow.

Kyongmin Yeo Tongming Zhou K.C. Leong

Heat transfer enhancement

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Citations (0)

Experimental Study of Passive Heat Transfer Enhancement in a Drag-Reducing Flow

Heat Transfer Engineering (2006)

K. H. Yeo Tongming Zhou K.C. Leong

Abstract Drag and heat transfer reduction were examined in a fully developed two-dimensional drag-reducing flow with different concentrations of surfactant additives. A row of low-profile mixers was used to enhance heat transfer in the flow. The effect of the low-profile mixers on heat transfer enhancement was examined in terms of the local Nusselt number for the surfactant concentration of 90 ppm. A comparison of the cases with and without low-profile mixers show that the average Nusselt number is enhanced by about 170% for Reynolds numbers of 7000, 12000, and 16200 with only a small pressure drop penalty. This increase in heat transfer performance might be related to the longitudinal vortices generated by the low-profile mixers, resulting in the enhancement of the bulk exchange of fluid between the main flow and the near-wall region. It was found that the enhancement of the low-profile mixers to the heat transfer rate starts to deteriorate in the streamwise direction at a certain location downstream of the mixers. The location of the onset of the deterioration shifts downstream with an increase in the Reynolds number. Acknowledgments The authors wish to acknowledge the financial support from Nanyang Technological University, Singapore, through its Academic Research Fund (AcRF) RG 13/02.

Heat transfer enhancement

10.1080/01457630600985501

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Citations (3)

A Benchmark Study on the Thermal Conductivity of Nanofluids

Mechanical Engineering (2009)

Jacopo Buongiomo David C. Venerus Naveen Prabhat Thomas McKrell Jessica Townsend

Benchmark (surveying)

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Forced convection heat transfer from vertically stacked fin arrays with a shrouding wall

International Communications in Heat and Mass Transfer (1992)

K.C. Toh K.C. Leong Tae-Won Lim Y.K. Ong

Fin

Forced convection

10.1016/0735-1933(92)90083-t

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Citations (1)

A critical review of filmwise natural and forced convection condensation on enhanced surfaces

Applied Thermal Engineering (2020)

Jin Yao Ho K.C. Leong

Forced convection

Fin

10.1016/j.applthermaleng.2020.116437

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Citations (32)

Filmwise condensation of steam on sinusoidal pin fin arrays: Effects of fin height and fin pitch

International Journal of Heat and Mass Transfer (2018)

Jin Yao Ho K.C. Leong Teck Neng Wong

Fin

Annular fin

Selective Laser Melting

10.1016/j.ijheatmasstransfer.2018.10.104

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Citations (20)

Erratum: “An Experimental Study of Heat Transfer of a Porous Channel Subjected to Oscillating Flow” [ASME J. Heat Transfer, 123, No. 1, pp. 162–170]

Journal of Heat Transfer (2001)

Haoyang Fu K.C. Leong and X. Y. Huang C. Y. Liu

1. Ligament diameters for ERG A1 40 PPI and ERG RVC 45 PPI in Table 1 should read as 1.194×10−4 m and 1.086×10−4 m, respectively. 2. The magnitudes of the Reynolds number labels indicated as Re on Figs. 2–5 and Fig. 7 should be divided by 10. 3. The Reynolds number scale in the x-axes of Figs. 8–10 should be divided by 10.

Erg

10.1115/1.1412482

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